Utility knife



FIG. 1 is a perspective view of a utility knife according to our new design;

FIG. 2 is a left-side view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Conventional shading is illustrated for purposes of highlighting the line drawings, but forms no part of the claimed design.

The broken line showing of portions of the utility knife is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a utility knife, as shown and described. 